Japanese Style outlet 120 V ( 20 V step up). You could potential cause some damage if you made some mistakes here. For one, if you plug the Japanese Device into the US style slot, because you assume the fronts are both outputting the same voltage, 120 – 140 V could damage the device.
https://www.amazon.com/VCT-VT-500J-Japanese-Transformer-Converts/dp/B000PC4JL4

